A Civic Biology: Presented in Problems |
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acid alcohol American Book Company bacteria bean birds blood vessels body breeding called Calories CALORIES PER POUND Carbohydrates carbon dioxide cause cells cent Civic Biology contain corn corpuscles cotyledon Demonstration digestive disease eggs environment enzymes especially example experiment fever fish flower fluid food materials food tube forest frog fruit FUEL VALUE functions germs gills Ginn and Company glands grain grape sugar green plants grow growth habit heat human Hygiene important insects intestine known larvæ leaf living matter lungs Macmillan Company microscope milk mold mouth muscles nerve nervous system nitrogen nutrients organs osmosis oxidation oxygen paramecium parasite pass plant or animal plants and animals poison pollen pollen tube Problems in Civic protein protoplasm Protozoa respiration root hairs seeds skin soil spores starch stem stomata structure substances supply surface temperature tiny tion tissues trees tuberculosis typhoid walls waste yeast young